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.(No Model.)

D. MONABB.

ROTARY HEEL POR BOOTS 0R SHOES. No. 596,758. Patented Jan. 4,1898.

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UNITED STATES PATENT rricE.

DUNCAN MCNABB, OF LOVELL, MASSACHUSETTS, ASSIGNOR OF TlVO-THIRDS TO ANDREW LVINGSTON AND JEANNIE OOCHRANE, OF SAME PLACE.

Boo-rs on SHOES.

SPECIFICATION forming part of Letters Patent No. 596,758, dated January 4, 1898.

Application filed March 1 51 139 7- .To a/ZZ whom it may con-carlo:

Be it known that I, DUNCAN MGNABB, a citizen of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Self- Locking Rotary Heels for Boots or Shoes, of which the following is a specification.

My invention relates to self-locking rotary heels for boots or shoes; and it consists in the devices and combinations hereinafter described and claimed.

The object of this invention is to construct a heel consisting of an upper section secured to the sole of the shoe and a lower rotary section, to maintain the tworsections of the heel together' byspring-pressure so that said lower section may be revolved simply by pulling down said lower section against the tension of the spring, to disengage certain pins carried by one section from holes in the Vother section, and to avoid the necessity of any tools or screwing to secure the desired adjustment.

In the accompanying drawings, Figure lis a vertical central longitudinal section, on the line l l in Fig. 4, of the upper, sole, and heel' of a shoe provided with my improvement, the sleeve, spring, bolt, plates, and pins being in side elevation; Fig. 2, a similar enlarged sec tion of all the parts shown in Fig. l, except the pins and bolt, which are in side elevation 5 Fig. 3, similar to Fig. 1, except that in Fig. 3 the heel-sections are drawn apart for adjustment, while in Fig. l said heelsections are in Contact; Fig. 4, a plan of the bottom of the upper heel-section and adjacent parts of the sole; Fig. 5, a plan of the lower heelsection; Fig.' 6, a section of the heel in the saine plane as in Fig. 2, showing also a steadytube.

A is the sole, and A the upper, of a shoe, both being of any usual construction.

The heel B is preferably circular in all its horizontal cross-sections and consists of two sections I) b', the upper section b secured by any usual means to the sole A and having a central aperture b2 to receive a sleeve O. The sleeve O is provided at its upper end with an external annular flange c, of a size to nearly i'ill said aperture b2, but loosely enough to permit saidsleeve to move vertically in said Serial No. 627,558. (No model.)

aperture. A spiral spring D surrounds said sleeve and is compressed between said fiange c and a horizontal plate E, secured to or near the bottom of the upper heel-section h. The 5 5 plate E has an opening through which the body of the sleeve C may slide. Another plate E is secured to the top of the lower see tion h' of the heel, and through a Washer F and said plate Eabolt F is passed up into the 6o otherwise closed lower end c' of the sleeve C, said bolt and the centralhole @in said lower end being screw-threaded, as shown at f, to engage each other, so that the bolt may be turned to draw down said sleeve and increase 6 5 the tension of the spring D, the bolt having, preferably, a slot to receive a screw-driver. Obviouslythe tension ot' said spring D will normally hold the heel-sections in contact with each other. j 7o Y A lift h4 is arranged between the plates E E to prevent a possible rattling of the same against each other, and this lift is represented, Fig. 3, as secured t0 the bottoni of the upper heel-section ZJ.

Pins G G, two or more, are secured vertically in one heel-section and project from the same and normally enter holes in the plate ot' the other section to prevent accidental turning of one section on the other, these pins 8o being represented as secured in and normally projecting from the bottoni of the upper heelsection into holes e e e e in the plate E' of the other heelsection, there being four such holes, in order that the lower heel-section may 85 be turned quartei-Way around at one time.

The non-adjacent ends of the apertures b2 and b3, respectively, in the heel-sections may be closed'by plugs b6 b5, of leather or other material. 9o

It is evident that separating the heel-sections by drawing the section ZJ away from the section b will allow the former to be turned as desired and that the spring and pins prevent any accidental turning of the section b'. 95

I claim as my inventionl A heel for boots and shoes, consisting of an upper section and a lower section, pivoted to each other, pins, rigidly secured in and, projecting from one of said sections and enroo gaging holes,with which the other of said sections is provided, and a spring, normally to and secured in the lower end of said sleeve, to hold said sections in contact, and pins, projecting from said upper section and adapted to engage holes with which said lower section is provided.

In witness whereof I have signed this speciication, in the presence vof two attesting wit- 1 nesses, this 8th-day of March, A. D. 1897. DUNCAN MCNABB.

Witnesses:

ALBERT M. MOORE, CHARLES EARLY, 

